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Note 11 - Net Loss Per Share of Common Stock (Details Textual) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 1,402,978 966,748 1,402,978 966,748